Please i flashed this Rom for Opsson S7. It boots to the Opsson logo but does not come on. Also,i can not enter into Recovery Mode at all. I have tried all the button combinations yet no head way. Please help me. Thanks

Please i flashed this Rom for Opsson S7. It boots to the Opsson logo but does not come on. Also,i can not enter into Recovery Mode at all. I have tried all the button combinations yet no head way. Please help me. Thanks